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A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
Maybe Someday (GoogleCTF) CTF Archive 0
Hamiltonicity 2 (CryptoHack) CTF Archive 0
Fischlin's Transformation (CryptoHack) CTF Archive 0
OR Proof (CryptoHack) CTF Archive 0
Ticket Maestro (CryptoHack) CTF Archive 0
Weekly Top Users
#1 Blackash2023 4775
#2 Blupper 4350
#3 LiBr 4090
#4 v3r7ux 3655
#5 zeski 3165
Recent Solves
The Good, The Pad, The Ugly Sant
Resisting Bruteforce xoqs
Oracular Spectacular Diggory
Introduction to Isogenies D0pp3lgang3r
Recent Solutions
OR Proof kropotkin69 0
Non-Interactive chiv 0
The Good, The Pad, The Ugly JosePisco 2
Too Honest 0xndavd 1
Let's Prove It Again Ectario 1

Level Up

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